Book holder



FIG. 1 is a perspective view of the book holder in my new design;

FIG. 2 is a front view of the book holder thereof;

FIG. 3 is a rear view of the book holder thereof;

FIG. 4 is a top view of the book holder thereof;

FIG. 5 is a bottom view of the book holder thereof; and,

FIG. 6 is a right side view of the book holder thereof, the left side isan identical mirror image of the right side view.

CLAIM The ornamental design for a book holder, as shown and described.